Does your HF rigs automatic tuner have limited matching range? MFJs AutoTuner Extender transforms your antenna impedance up or down as much as 10 times! Puts nearly any antenna into the range of your automatic tuner. Extends range of manual antenna tuners also. Use with any transceiver 160 through 10 Meters with up to 300 Watts. On/Off, Bypass positions. MFJ-914 was carefully designed for flattest frequency response and lowest loss.